The goal of this clinical trial is to learn if "Yiqi Fuyuan Paste Formula" (a traditional Chinese medicinal paste made from medicinal and edible Chinese medicines and health food like Ginseng Radix et Rhizoma, Astragali Radix et Rhizoma, Codonopsis Radix, Atractylodis Macrocephalae Rhizoma, Poria Cocos, Coicis Semen, Dioscoreae Rhizoma, Nelumbinis Semen, Angelicae Sinensis Radix, Lycii Fructus, Citri Reticulatae Pericarpium, Juglandis Semen, Longan Arillus, Sesami Nigri Semen, Jujubae Fructus, Glycyrrhizae Radix et Rhizoma, and fine ingredients) works to ease Chronic Fatigue Syndrome (CFS) symptoms in adults. It will also learn about the safety of "Yiqi Fuyuan Paste Formula". The main questions it aims to answer are:
1. Does "Yiqi Fuyuan Paste Formula" help reduce CFS-related fatigue (measured by the Fatigue Assessment Instrument, FAI)
2. What underlying bodily changes (shown in blood tests) might explain its effects.
Researchers will compare "Yiqi Fuyuan Paste Formula" to a placebo (a look-alike substance that contains no drug) to see if "Yiqi Fuyuan Paste Formula" works to ease CFS symptoms.
Participants will:
1. Take "Yiqi Fuyuan Paste Formula" or a placebo every day for 2 months
2. Visit the clinic before and after the intervention for checkups and tests
3. Keep a diary of their symptoms